LDL is the primary contributor to arterial-clogging plaque. HDL is effective at removing excess cholesterol from the blood.
Heart diseases are the leading cause of death in a number of countries. Atherosclerosis causes the constriction of the blood vessels that supply the heart with blood, leading to heart disease. Gradually, fatty deposits (or plaque) accumulate on the interior of artery walls, reducing the space through which blood may travel to the heart.
Cholesterol is an essential component of all cell membranes and is necessary for numerous metabolic processes. It is produced in the liver by the body. Cholesterol-containing blood lipids (fats) include high-density lipoprotein (HDL) and low-density lipoprotein (LDL). LDL ('bad') cholesterol can cause the formation of plaque in the arteries, whereas HDL ('good') cholesterol helps eliminate cholesterol from the body and makes it more difficult for plaque to form.
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When a malignant tumor spreads to sites distant from the primary tumor its called metastasis.
